Improvement in molders  gates or sprues



JOHN M. KILLIN.

Melders Gate or Spr'ue.

N0.127,351. PatentedMay 28,1872. I

.Zhuentary UNITED STATES PATENT @rrron.

JOHN M. KILLIN, OF PITTSBURG, PENNSYLVANIA.

Specification forming part of Letters Patent No. 127,351, dated May 28, 1872.

To all whom it may concern:

Be it known that I, JOHN M. KILLIN, of Pittsburg, of the county of Allegheny and State of Pennsylvania, have invented a new and Improved Molders Gate or Sprue; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing forming part of this specification, in which- Figure 1 is a side elevation of my improved sprue. Fig. 2 is a top-plan view of the same. Fig. 3 is a perspective view of a modified form of the sprue, and Fig. 4 is a perspective view of a sprue as ordinarily constructed.

Similar letters of reference in the accompanying drawing denote the same parts.

My invention has for its object to improve the construction of molders fiat gates or sprues, by which sprue-holes are formed in the cope, through which the molten metal is poured into the .molcls for casting thin plat-es, hollow ware, 850. From one to six of these gates are used by the molder on one piece of casting, and it is quite customary for the number used to exceed in weight the casting produced. When the metal is poured and the mold full it rises in the sprues, frequently filling them completely, though generally from one-half to three-quarters full.

The usual construction of the fiatgates is in the formof a wedge, as shown in Fig. 4 of the drawing. With this form, however, considerable difficulty is encountered in pouring the metal evenly, or so that it shall enter the mold the entire Width of the sprue, or, in other words, along its entire foot.

To overcome this difficulty my invention consists in constructing the flat gate with an enlarged center in the form of a flattened cone inverted. By this construction the largest bulk of the molten metal is at the center of the sprue, and its weight forces the remainder foot of the sprue. The inverted conical openin g formed by the gate being kept full of the molten metal in pouring, the slag which sometimes escapes from the ladle will float in the upper part of such enlarged opening, and but a small amount of metal will be left in the sprue after the pouring process has been completed. By my improved construction, therefore, I am enabled .to save at least fifty per cent. of the waste due to the use of the wedgeshaped gate.

In the accompanying drawing the gate is shown composed ofa thin plate or board, A, having a sharpened foot, B; and 0 is the inverted conical center-piece, with its apex terminating at or near the foot, as shown. 1) is the handle let into the top of the gate, by which the latter is removed from the mold or transported from place to place.

In Fig. 3 I have shown a modification of the gate, which consists in forming a recess inthe foot immediately beneath the apex of the cone. This I designate as a forked flat gate.

Other modifications may be constructed to suit the varying forms of the castings to be I made Without departing from the principle of my invention.

Having thus described myinvention, what I claim is- 1. A molders flat gate or sprne, consistin g of a thin plate or board, A, having an enlarged center, 0, substantially as described, for the purposes specified.

2. In combination with the gate or sprue, A G, I claim the handle D, substantially as described, for the purpose specified.

JOHN M. KILLIN.

Witnesses:

RoBr. S. FRAZER, M. T. DUNN. 

